<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- CSS -->
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.2/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <!-- jQuery and JavaScript Bundle with Popper -->
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.slim.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
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</head>
<body>
<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-airplane-engines" viewBox="0 0 16 16">
    <path d="M8 0c-.787 0-1.292.592-1.572 1.151A4.347 4.347 0 0 0 6 3v3.691l-2 1V7.5a.5.5 0 0 0-.5-.5h-1a.5.5 0 0 0-.5.5v1.191l-1.17.585A1.5 1.5 0 0 0 0 10.618V12a.5.5 0 0 0 .582.493l1.631-.272.313.937a.5.5 0 0 0 .948 0l.405-1.214 2.21-.369.375 2.253-1.318 1.318A.5.5 0 0 0 5.5 16h5a.5.5 0 0 0 .354-.854l-1.318-1.318.375-2.253 2.21.369.405 1.214a.5.5 0 0 0 .948 0l.313-.937 1.63.272A.5.5 0 0 0 16 12v-1.382a1.5 1.5 0 0 0-.83-1.342L14 8.691V7.5a.5.5 0 0 0-.5-.5h-1a.5.5 0 0 0-.5.5v.191l-2-1V3c0-.568-.14-1.271-.428-1.849C9.292.591 8.787 0 8 0ZM7 3c0-.432.11-.979.322-1.401C7.542 1.159 7.787 1 8 1c.213 0 .458.158.678.599C8.889 2.02 9 2.569 9 3v4a.5.5 0 0 0 .276.447l5.448 2.724a.5.5 0 0 1 .276.447v.792l-5.418-.903a.5.5 0 0 0-.575.41l-.5 3a.5.5 0 0 0 .14.437l.646.646H6.707l.647-.646a.5.5 0 0 0 .14-.436l-.5-3a.5.5 0 0 0-.576-.411L1 11.41v-.792a.5.5 0 0 1 .276-.447l5.448-2.724A.5.5 0 0 0 7 7V3Z"/>
</svg>
<div class="container-sm">100% wide until small breakpoint</div>
<div class="container-md">100% wide until medium breakpoint</div>
<div class="container-lg">100% wide until large breakpoint</div>
<div class="container-xl">100% wide until extra large breakpoint</div>

<button type="button" class="btn btn-primary">Primary</button>
<button type="button" class="btn btn-secondary">Secondary</button>
<button type="button" class="btn btn-success">Success</button>
<button type="button" class="btn btn-danger">Danger</button>
<button type="button" class="btn btn-warning">Warning</button>
<button type="button" class="btn btn-info">Info</button>
<button type="button" class="btn btn-light">Light</button>
<button type="button" class="btn btn-dark">Dark</button>

<button type="button" class="btn btn-link">Link</button>

<div class="btn-group" role="group" aria-label="Basic example">
    <button type="button" class="btn btn-secondary">首页</button>
    <button type="button" class="btn btn-secondary">JOIN US</button>
    <button type="button" class="btn btn-secondary">退出</button>
</div>

<div class="btn-group mr-2" role="group" aria-label="First group">
    <button type="button" class="btn btn-secondary">1</button>
    <button type="button" class="btn btn-secondary">2</button>
    <button type="button" class="btn btn-secondary">3</button>
    <button type="button" class="btn btn-secondary">4</button>
</div>

<div class="card" style="width: 18rem;">
    <img src="../07-定位+装饰/img/java.png" class="card-img-top" alt="...">
    <div class="card-body">
        <h5 class="card-title">Card title</h5>
        <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
        <a href="#" class="btn btn-primary">Go somewhere</a>
    </div>
</div>

<form>
    <div class="form-group">
        <label for="exampleInputEmail1">Email address</label>
        <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
        <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
    </div>
    <div class="form-group">
        <label for="exampleInputPassword1">Password</label>
        <input type="password" class="form-control" id="exampleInputPassword1">
    </div>
    <div class="form-group form-check">
        <input type="checkbox" class="form-check-input" id="exampleCheck1">
        <label class="form-check-label" for="exampleCheck1">Check me out</label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

<div class="media">
    <img src="../04-选择器的进阶+背景相关属性/img/yequ.png" style="width: 60px" class="mr-3" alt="...">
    <div class="media-body">
        <h5 class="mt-0">《夜曲》-周杰伦</h5>
        <p>Will you do the same for me? It's time to face the music I'm no longer your muse. Heard it's beautiful, be the judge and my girls gonna take a vote. I can feel a phoenix inside of me. Heaven is jealous of our love, angels are crying from up above. Yeah, you take me to utopia.</p>
    </div>
</div>
</body>
</html>